Indicate by check mark if the registrants are well-known seasoned issuers, as defined in Rule 405 of the Securities Act. Yes o No þ

Indicate by check mark if the registrants are not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No þ

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. Yes þ No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrants' knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of "accelerated filer and large accelerated filer" in Rule 12b-2 of the Securities Exchange Act of 1934.

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Act.) Yes o No þ

System Energy Resources meets the requirements set forth in General Instruction I(1) of Form 10-K and is therefore filing this Form 10-K with reduced disclosure as allowed in General Instruction I(2). System Energy Resources is reducing its disclosure by not including Part III, Items 10 through 13 in its Form 10-K.

The aggregate market value of Entergy Corporation Common Stock, $0.01 Par Value, held by non-affiliates as of the end of the second quarter of 2006, was $14.7 billion based on the reported last sale price of $70.75 per share for such stock on the New York Stock Exchange on June 30, 2006. Entergy Corporation is the sole holder of the common stock of Entergy Arkansas, Inc., Entergy Gulf States, Inc., Entergy Mississippi, Inc., Entergy New Orleans, Inc., and System Energy Resources, Inc. Entergy Corporation is also the sole holder of the common stock of Entergy Louisiana Holdings, Inc., which is the sole holder of the common membership interests in Entergy Louisiana, LLC.

Portions of the Proxy Statement of Entergy Corporation to be filed in connection with its Annual Meeting of Stockholders, to be held May 4, 2007, are incorporated by reference into Parts I and III hereof.

In this combined report and from time to time, Entergy Corporation, the Utility operating companies and System Energy, each makes statements as registrants concerning its expectations, beliefs, plans, objectives, goals, strategies, and future events or performance. Such statements are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as "believes," "intends," "plans," "predicts" and "estimates" and similar expressions are intended to identify forward-looking statements but are not the only means to identify these statements. Although each of these registrants believes that these forward-looking statements and the underlying assumptions are reasonable, it cannot provide assurance that they will prove correct. Any forward-looking statement is based on information current as of the date of this combined report and speaks only as of the date on which such statement is made. Except to the extent required by the federal securities laws, these registrants undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.

Forward-looking statements involve a number of risks and uncertainties. There are factors that could cause actual results to differ materially from those expressed or implied in the forward-looking statements, including those factors discussed in (a) Item 1A. Risk Factors, (b) Item 7. Management's Financial Discussion and Analysis, and (c) the following factors (in addition to others described elsewhere in this combined report and in subsequent securities filings):

• resolution of pending and future rate cases and negotiations, including various performance-based rate discussions and implementation of Texas legislation, and other regulatory proceedings, including those related to Entergy's System Agreement, Entergy's utility supply plan, recovery of storm costs, and recovery of fuel and purchased power costs
• Entergy's and its subsidiaries' ability to manage their operation and maintenance costs
• changes in utility regulation, including the beginning or end of retail and wholesale competition, the ability to recover net utility assets and other potential stranded costs, the implementation of the independent coordinator of transmission that includes Entergy's utility service territory, and the application of market power criteria by the FERC
• the economic climate, and particularly growth in Entergy's service territory
• variations in weather and the occurrence of hurricanes and other storms and disasters, including uncertainties associated with efforts to remediate the effects of Hurricanes Katrina and Rita and recovery of costs associated with restoration including Entergy's ability to obtain financial assistance from governmental authorities in connection with these storms
• the outcome of the Chapter 11 bankruptcy proceeding of Entergy New Orleans, and the impact of this proceeding on other Entergy companies
• the performance of Entergy's generating plants, and particularly the capacity factors at its nuclear generating facilities
• changes in the financial markets, particularly those affecting the availability of capital and Entergy's ability to refinance existing debt, execute its share repurchase program, and fund investments and acquisitions
• actions of rating agencies, including changes in the ratings of debt and preferred stock, changes in general corporate ratings, and changes in the rating agencies' ratings criteria
• changes in inflation, and interest rates
• Entergy's ability to develop and execute on a point of view regarding future prices of electricity, natural gas, and other energy-related commodities
• Entergy's ability to purchase and sell assets at attractive prices and on other attractive terms
• prices for power generated by Entergy's unregulated generating facilities, the ability to hedge, sell power forward or otherwise reduce the market price risk associated with those facilities, including the Non-Utility Nuclear plants, and the prices and availability of fuel and power Entergy must purchase for its utility customers, and Entergy's ability to meet credit support requirements for fuel and power supply contracts
• volatility and changes in markets for electricity, natural gas, uranium, and other energy-related commodities
• changes in regulation of nuclear generating facilities and nuclear materials and fuel, including possible shutdown of nuclear generating facilities, particularly those in the northeastern United States
• uncertainty regarding the establishment of interim or permanent sites for spent nuclear fuel storage and disposal
• resolution of pending or future applications for license extensions or modifications of nuclear generating facilities

• changes in law resulting from the new federal energy legislation, including the effects of PUHCA repeal
• changes in environmental, tax, and other laws, including requirements for reduced emissions of sulfur, nitrogen, carbon, mercury, and other substances
• advances in technology
• the potential effects of threatened or actual terrorism and war
• the effects of Entergy's strategies to reduce tax payments
• the effects of litigation and government investigations
• changes in accounting standards and corporate governance
• Entergy's ability to attract and retain talented management and directors

Certain abbreviations or acronyms used in the text and notes are defined below:

i

ii

iii

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3

Management of Entergy Corporation and its subsidiaries has prepared and is responsible for the financial statements and related financial information included in this document. To meet this responsibility, management establishes and maintains a system of internal controls designed to provide reasonable assurance regarding the preparation and fair presentation of financial statements in accordance with generally accepted accounting principles. This system includes communication through written policies and procedures, an employee Code of Entegrity, and an organizational structure that provides for appropriate division of responsibility and training of personnel. This system is also tested by a comprehensive internal audit program.

Entergy management assesses the effectiveness of Entergy's internal control over financial reporting on an annual basis. In making this assessment, management uses the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control - Integrated Framework. Management acknowledges, however, that all internal control systems, no matter how well designed, have inherent limitations and can provide only reasonable assurance with respect to financial statement preparation and presentation.

Entergy Corporation and its subsidiaries' independent registered public accounting firm, Deloitte & Touche LLP, has issued an attestation report on Entergy management's assessment of the effectiveness of Entergy's internal control over financial reporting as of December 31, 2006, which is included herein on pages 344 through 350.

In addition, the Audit Committee of the Board of Directors, composed solely of independent Directors, meets with the independent auditors, internal auditors, management, and internal accountants periodically to discuss internal controls, and auditing and financial reporting matters. The Audit Committee appoints the independent auditors annually, seeks shareholder ratification of the appointment, and reviews with the independent auditors the scope and results of the audit effort. The Audit Committee also meets periodically with the independent auditors and the chief internal auditor without management present, providing free access to the Audit Committee.

Based on management's assessment of internal controls using the COSO criteria, management believes that Entergy maintained effective internal control over financial reporting as of December 31, 2006. Management further believes that this assessment, combined with the policies and procedures noted above, provides reasonable assurance that Entergy's financial statements are fairly and accurately presented in accordance with generally accepted accounting principles.

4

Entergy operates primarily through two business segments: Utility and Non-Utility Nuclear.

• Utility generates, transmits, distributes, and sells electric power in a four-state service territory that includes portions of Arkansas, Mississippi, Texas, and Louisiana, including the City of New Orleans; and operates a small natural gas distribution business.
• Non-Utility Nuclear owns and operates five nuclear power plants located in the northeastern United States and sells the electric power produced by those plants primarily to wholesale customers. This business also provides services to other nuclear power plant owners.

In addition to its two primary, reportable, operating segments, Entergy also operates the non-nuclear wholesale assets business. The non-nuclear wholesale assets business sells to wholesale customers the electric power produced by power plants that it owns while it focuses on improving performance and exploring sales or restructuring opportunities for its power plants. Such opportunities are evaluated consistent with Entergy's market-based point-of-view.

Following are the percentages of Entergy's consolidated revenues and net income generated by its operating segments and the percentage of total assets held by them:

In August and September 2005, Hurricanes Katrina and Rita caused catastrophic damage to large portions of the Utility's service territory in Louisiana, Mississippi, and Texas, including the effect of extensive flooding that resulted from levee breaks in and around the greater New Orleans area. The storms and flooding resulted in widespread power outages, significant damage to electric distribution, transmission, and generation and gas infrastructure, and the loss of sales and customers due to mandatory evacuations and the destruction of homes and businesses. Total restoration costs through December 31, 2006 for the repair or replacement of the Utility's electric and gas facilities damaged by Hurricanes Katrina and Rita and for business continuity are $1.48 billion (including $38 million of AFUDC). The costs include $828 million in construction expenditures and $654 million recorded originally as regulatory assets. Entergy recorded regulatory assets in accordance with its accounting policies because management believes that recovery of these prudently incurred costs through some form of regulatory mechanism is probable, based on historic treatment of such costs in the Utility's service territories and communications with local regulators. These costs do not include other potential incremental losses, such as the inability to recover fixed costs scheduled for recovery through base rates, which base rate revenue was not received due to a loss of anticipated sales. For instance, at Entergy New Orleans, the Utility operating company that continues to experience a reduction in the level of cost recovery due to lost customers caused by Hurricane Katrina, Entergy estimates that lost net revenue due to Hurricane Katrina will total approximately $194 million through 2007. In addition, Entergy estimates that the hurricanes caused $38 million of uncollectible Utility customer receivables. Entergy estimates that its additional storm restoration spending, excluding Entergy New Orleans, will be approximately $60 million.

5

Entergy is pursuing a broad range of initiatives to recover storm restoration and business continuity costs. Initiatives include obtaining reimbursement of certain costs covered by insurance, obtaining assistance through federal legislation for damage caused by Hurricanes Katrina and Rita, and, as noted above, pursuing recovery through existing or new rate mechanisms regulated by the FERC and local regulatory bodies, in combination with securitization. Entergy Gulf States, Entergy Louisiana, Entergy Mississippi, and Entergy New Orleans have filed with their respective retail regulators for recovery of storm restoration costs. The proceedings are discussed in Note 2 to the financial statements.

See Note 8 to the financial statements for a discussion of Entergy's non-nuclear property insurance program. Entergy is currently evaluating the amount of the covered losses for each of the affected Utility operating companies, working with insurance adjusters, and preparing proofs of loss for Hurricanes Katrina and Rita. There is an aggregation limit of $1 billion for all parties insured by OIL, Entergy's primary insurer, for any one occurrence, and Entergy has been notified by OIL that it expects claims for both Hurricanes Katrina and Rita to materially exceed this limit. The Utility operating companies have received $51.5 million through December 31, 2006 on their insurance claims. Entergy currently estimates that its remaining net insurance recoveries for the losses caused by the hurricanes, including the effect of the OIL aggregation limit being exceeded, will be approximately $350 million. Entergy currently expects to receive payment for the majority of its estimated insurance recoveries related to Hurricanes Katrina and Rita through 2009.

In December 2005, the U.S. Congress passed the Katrina Relief Bill, a hurricane aid package that includes $11.5 billion in Community Development Block Grants (for the states affected by Hurricanes Katrina, Rita, and Wilma) that allows state and local leaders to fund individual recovery priorities. The bill includes language that permits funding to be provided for infrastructure restoration.

Entergy Mississippi filed a request with the Mississippi Development Authority for CDBG funding for reimbursement of its Hurricane Katrina infrastructure restoration costs and received $81 million in October 2006.

Entergy New Orleans, Entergy Louisiana, and Entergy Gulf States-Louisiana provided justification statements to state and local officials in March 2006 and presented revised justification statements to the Louisiana Recovery Authority (LRA) in September 2006. The statements include the estimated costs of Hurricanes Katrina and Rita damage, as well as for Entergy New Orleans a lost customer base component intended to help offset the need for storm-related rate increases. The statements include justification for CDBG funding of $592 million for Entergy New Orleans, $539 million for Entergy Louisiana, and $183 million for Entergy Gulf States-Louisiana.

In October 2006, the LRA Board endorsed a resolution proposing to allocate $200 million in CDBG funds to Entergy New Orleans to defray gas and electric utility system repair costs in an effort to provide rate relief for Entergy New Orleans customers. The proposal was developed as an action plan amendment and published for public comment. State lawmakers approved the action plan in December 2006, and the U. S. Department of Housing and Urban Development approved it in February 2007. In addition, the City Council must review and certify the amount of Entergy New Orleans' eligible storm costs before an application can be filed with the LRA and CDBG funding can be released to Entergy New Orleans. Entergy

New Orleans filed applications seeking City Council certification of $210 million in storm-related costs incurred through December 2006. Entergy New Orleans has supplemented this request to include the estimated future cost of the gas system rebuild. In January 2007, the City Council passed a resolution in which it stated its intent to render a decision in the certification proceeding by March 2007.

Because of the effects of Hurricane Katrina, on September 23, 2005, Entergy New Orleans filed a voluntary petition in the United States Bankruptcy Court for the Eastern District of Louisiana seeking reorganization relief under the provisions of Chapter 11 of the United States Bankruptcy Code (Case No. 05-17697). Entergy Corporation owns 100 percent of the common stock of Entergy New Orleans, has continued to supply general and administrative services through Entergy Services, and has provided debtor-in-possession financing to Entergy New Orleans. Uncertainties surrounding the nature, timing, and specifics of the bankruptcy proceedings, however, caused Entergy to deconsolidate Entergy New Orleans and reflect Entergy New Orleans' financial results under the equity method of accounting retroactive to January 1, 2005. Because Entergy owns all of the common stock of Entergy New Orleans, this change did not affect the amount of net income Entergy records from Entergy New Orleans' operations for any current or prior period, but did result in Entergy New Orleans' net income for 2005 and 2006 being presented as "Equity in earnings (loss) of unconsolidated equity affiliates" rather than its results being included in each individual income statement line item, as is the case for periods prior to 2005. Entergy has reviewed the carrying value of its equity investment in Entergy New Orleans to determine if an impairment has occurred as a result of the storm, the flood, the power outages, restoration costs, and changes in customer load. Entergy determined that no impairment has occurred because management believes that cost recovery is probable. Entergy will continue to assess the carrying value of its investment in Entergy New Orleans as developments occur in Entergy New Orleans' recovery efforts.

On February 5, 2007, Entergy New Orleans filed an amended plan of reorganization and a disclosure statement with the bankruptcy court. The bankruptcy court entered an order on February 13, 2007 that approves the adequacy of Entergy New Orleans' disclosure statement. The Unsecured Creditors' Committee also filed a plan of reorganization on February 5, 2007. The Unsecured Creditors' Committee's plan is similar in some respects to Entergy New Orleans' plan, but contains several differences. The significant differences are noted below. A hearing regarding confirmation for both plans of reorganization is scheduled for May 3 and 4, 2007.

Entergy New Orleans' plan of reorganization reflects its continuing effort to work with federal, state, and local authorities to resolve the bankruptcy in a manner that allows Entergy New Orleans' customers to be served by a financially viable entity as required by law. The plan of reorganization provides full compensation to Entergy New Orleans' creditors whose claims are allowed by the bankruptcy court. Conditions precedent proposed in Entergy New Orleans' plan of reorganization before it can become effective include:

• A final confirmation order from the bankruptcy court approving the plan of reorganization;
• Receipt by Entergy New Orleans of insurance proceeds of at least $50 million;
• Receipt by Entergy New Orleans of $200 million in CDBG funding; and
• No material adverse change shall have occurred from and after the confirmation date of the plan of reorganization.

Refer to "SELECTED FINANCIAL DATA - FIVE-YEAR COMPARISON OF ENTERGY CORPORATION AND SUBSIDIARIES" which accompanies Entergy Corporation's financial statements in this report for further information with respect to operating statistics.

Utility

Following is an analysis of the change in net revenue, which is Entergy's measure of gross margin, comparing 2006 to 2005.

The base revenues variance resulted primarily from increases effective October 2005 in the Louisiana jurisdiction of Entergy Gulf States for the 2004 formula rate plan filing and the annual revenue requirement related to the purchase of power from the Perryville generating station, and increases in the Texas jurisdiction of Entergy Gulf States related to an incremental purchased capacity recovery rider that began in December 2005 and a transition to competition rider that began in March 2006. The Attala costs variance is due to the recovery of Attala power plant costs at Entergy Mississippi through the power management rider. The net income effect of the Attala cost recovery is partially offset by Attala costs in other operation and maintenance expenses, depreciation expense, and taxes other than income taxes.

The fuel recovery variance resulted primarily from adjustments of fuel clause recoveries at Entergy Gulf States - Louisiana and increased recovery in 2006 of fuel costs from retail and special rate customers.

The pass-through rider revenue variance is due to a change in 2006 in the accounting for city franchise tax revenues in Arkansas as directed by the APSC. The change results in an increase in rider revenue with a corresponding increase in taxes other than income taxes, resulting in no effect on net income.

The transmission revenue variance is primarily due to new transmission customers in 2006. Also contributing to the increase was an increase in rates effective June 2006.

The storm cost recovery variance is due to the return earned on the interim recovery of storm-related costs at Entergy Louisiana and Entergy Gulf States - Louisiana in 2006 as allowed by the LPSC. The storm cost recovery filings are discussed in Note 2 to the financial statements.

The volume/weather variance resulted from an increase of 1.7% in electricity usage primarily in the industrial sector. The increase was partially offset by the effect of less favorable weather on billed sales in the residential sector, compared to the same period in 2005, and a decrease in usage during the unbilled period.

The price applied to unbilled sales variance is due to the exclusion in 2006 of the fuel cost component in the calculation of the price applied to unbilled sales. Effective January 1, 2006, the fuel cost component is no longer included in the unbilled revenue calculation at Entergy Louisiana and the Louisiana jurisdiction of Entergy Gulf States, which is in accordance with regulatory treatment. See "MANAGEMENT'S FINANCIAL DISCUSSION AND ANALYSIS - Critical Accounting Estimates" herein.

The purchased power capacity variance is primarily due to higher capacity charges and new purchased power contracts in 2006. A portion of the variance is due to the amortization of deferred capacity costs and is offset in base revenues due to base rate increases implemented to recover incremental deferred and ongoing purchased power capacity charges, as discussed above.

Non-Utility Nuclear

Net revenue increased for Non-Utility Nuclear primarily due to higher pricing in its contracts to sell power. Also contributing to the increase in revenues was increased generation in 2006 due to power uprates completed in 2005 and 2006 at certain plants and fewer refueling outages in 2006. Following are key performance measures for Non-Utility Nuclear for 2006 and 2005:

Other operation and maintenance expenses increased for Non-Utility Nuclear from $588 million in 2005 to $637 million in 2006 primarily due to the timing of refueling outages, increased benefit and insurance costs, and increased NRC fees.

Taxes other than income taxes increased for the Utility from $322 million in 2005 to $361 million in 2006 primarily due to an increase in city franchise taxes in Arkansas due to a change in 2006 in the accounting for city franchise tax revenues as directed by the APSC. The change results in an increase in taxes other than income taxes with a corresponding increase in rider revenue, resulting in no effect on net income. Also contributing to the increase was higher franchise tax expense at Entergy Gulf States as a result of higher gross revenues in 2006 and a customer refund in 2005.

Other income increased for the Utility from $111 million in 2005 to $156 million in 2006 primarily due to carrying charges recorded on storm restoration costs.

Other income increased for Non-Utility Nuclear primarily due to miscellaneous income of $27 million ($16.6 million net-of-tax) resulting from a reduction in the decommissioning liability for a plant as a result of a revised decommissioning cost study and changes in assumptions regarding the timing of when decommissioning of a plant will begin.

Other income increased for Parent & Other primarily due to a gain related to its Entergy-Koch investment of approximately $55 million (net-of-tax) in the fourth quarter of 2006. In 2004, Entergy-Koch sold its energy trading and pipeline businesses to third parties. At that time, Entergy received $862 million of the sales proceeds in the form of a cash distribution by Entergy-Koch. Due to the November 2006 expiration of contingencies on the sale of Entergy-Koch's trading business, and the corresponding release to Entergy-Koch of sales proceeds held in escrow, Entergy received additional cash distributions of approximately $163 million during the fourth quarter of 2006 and recorded a gain of approximately $55 million (net-of-tax). Entergy expects future cash distributions upon liquidation of the partnership will be less than $35 million.

Interest charges increased for the Utility and Parent & Other primarily due to additional borrowing to fund the significant storm restoration costs associated with Hurricanes Katrina and Rita.

In April 2006, Entergy sold the retail electric portion of the Competitive Retail Services business operating in the ERCOT region of Texas, and now reports this portion of the business as a discontinued operation. Earnings for 2005 were negatively affected by $44.8 million (net-of-tax) of discontinued operations due to the planned sale. This amount includes a net charge of $25.8 million (net-of-tax) related to the impairment reserve for the remaining net book value of the Competitive Retail Services business' information technology systems. Results for 2006 include an $11.1 million gain (net-of-tax) on the sale of the retail electric portion of the Competitive Retail Services business operating in the ERCOT region of Texas.

The effective income tax rates for 2006 and 2005 were 28.1% and 37.3%, respectively. The lower effective income tax rate in 2006 is primarily due to tax benefits, net of reserves, resulting from the tax capital loss recognized in connection with the liquidation of Entergy Power International Holdings, Entergy's holding company for Entergy-Koch, LP. Also contributing to the lower rate for 2006 is an IRS audit settlement that allowed Entergy to release from its tax reserves all settled issues from 1996-1998. See Note 3 to the financial statements for a reconciliation of the federal statutory rate of 35.0% to the effective income tax rates, and for additional discussion regarding income taxes.

2005 Compared to 2004

Following are income statement variances for Utility, Non-Utility Nuclear, Parent & Other business segments, and Entergy comparing 2005 to 2004 showing how much the line item increased or (decreased) in comparison to the prior period:

The uncertainties inherent in Entergy New Orleans' bankruptcy proceedings caused Entergy to deconsolidate Entergy New Orleans and reflect Entergy New Orleans' financial results under the equity method of accounting retroactive to January 1, 2005. Because Entergy owns all of the common stock of Entergy New Orleans, this change did not affect the amount of net income Entergy records resulting from Entergy New Orleans' operations for any current or prior period, but did result in Entergy New Orleans' net income for 2005 and 2006 being presented as "Equity in earnings (loss) of unconsolidated equity affiliates" rather than its results being included in each individual income statement line item, as is the case for 2004. Transactions in 2005 and 2006 between Entergy New Orleans and other Entergy subsidiaries are not eliminated in consolidation as they are in 2004. The variance explanations for 2005 compared to 2004 below reflect the 2004 results of operations of Entergy New Orleans as if it were deconsolidated in 2004, consistent with the 2005 presentation as "Equity in earnings (loss) of unconsolidated equity affiliates." Entergy's as reported consolidated results for 2004 and the amounts included in those consolidated results for Entergy New Orleans, which exclude inter-company items, are set forth in the table below.

Utility

The price applied to unbilled sales variance resulted primarily from an increase in the fuel cost component included in the price applied to unbilled sales. The increase in the fuel cost component is attributable to an increase in the market prices of natural gas and purchased power. See "Critical Accounting Estimates - Unbilled Revenue" and Note 1 to the financial statements for further discussion of the accounting for unbilled revenues.

The rate refund provisions variance is due primarily to accruals recorded in 2004 for potential rate action at Entergy Gulf States and Entergy Louisiana.

The volume/weather variance includes the effect of more favorable weather in 2005 compared to 2004 substantially offset by a decrease in weather-adjusted usage due to the effects of Hurricanes Katrina and Rita and a decrease in usage during the unbilled sales period.

The 2004 deferrals variance is due to the deferrals related to Entergy's voluntary severance program, in accordance with a stipulation with the LPSC staff. The deferrals are being amortized over a four-year period effective January 2004.

Non-Utility Nuclear

Net revenue increased for Non-Utility Nuclear primarily due to higher pricing in its contracts to sell power. Also contributing to the increase in revenues was increased generation in 2005 due to power uprates at several plants completed in 2004 and 2005 and fewer planned and unplanned outages in 2005. Following are key performance measures for Non-Utility Nuclear for 2005 and 2004:

Other operation and maintenance expenses increased slightly for the Utility from $1.467 billion in 2004 to $1.471 billion in 2005. The variance includes the following:

• an increase of $10 million in nuclear expenses for contract and material costs associated with maintenance outages and nuclear refueling outage pre-work;
• an increase of $10 million in miscellaneous regulatory reserves;
• an increase of $8 million in storm reserves (unrelated to Hurricanes Katrina and Rita);
• an increase of $5 million in estimated loss provisions recorded for the bankruptcy of CashPoint, which managed a network of payment agents for the Utility operating companies;
• an increase of $5 million in payroll and benefits costs which includes higher pension and post-retirement benefit costs substantially offset by incentive compensation true-ups;
• a decrease of $18 million due to a shift in labor and material costs from normal maintenance work to storm restoration work; and
• a decrease of $16 million related to proceeds received from the radwaste settlement, which is discussed further in "Significant Factors and Known Trends - Central States Compact Claim."

• a revision in 2004 to the estimated decommissioning cost liability for River Bend in accordance with a new decommissioning cost study that reflected a life extension for the plant. For the portion of River Bend not subject to cost-based ratemaking, the revised estimate resulted in the elimination of the asset retirement cost that had been recorded at the time of adoption of SFAS 143 with the remainder recorded as miscellaneous income of $27.7 million;
• a decrease of $26.3 million in Entergy New Orleans earnings, which is now reported as an unconsolidated equity affiliate for 2005 in the "Equity in earnings (loss) of unconsolidated equity affiliates" line on the Income Statement. The decrease in Entergy New Orleans' earnings is primarily a result of the effects of Hurricane Katrina, which caused lower net revenue, partially offset by lower other operation and maintenance expenses and lower interest charges; and
• a decrease of $10.1 million at Entergy Gulf States due to a reduction in 2004 in the loss provision for an environmental clean-up site.

Net debt consists of debt less cash and cash equivalents. Debt consists of notes payable, capital lease obligations, preferred stock with sinking fund, and long-term debt, including the currently maturing portion. Capital consists of debt, shareholders' equity, and preferred stock without sinking fund. Net capital consists of capital less cash and cash equivalents. Entergy uses the net debt to net capital ratio in analyzing its financial condition and believes it provides useful information to its investors and creditors in evaluating Entergy's financial condition.

Long-term debt, including the currently maturing portion, makes up substantially all of Entergy's total debt outstanding. Following are Entergy's long-term debt principal maturities and estimated interest payments as of December 31, 2006. To estimate future interest payments for variable rate debt, Entergy used the rate as of December 31, 2006. The figures below include payments on the Entergy Louisiana and System Energy sale-leaseback transactions, which are included in long-term debt on the balance sheet.